Special additive for bare concrete

Abstract

The invention discloses a special additive for a bare concrete, relates to the field of concrete additives and aims at solving the problems in the prior art that the adverse effect of the additive onthe fluidity of the concrete is huge and the improvement of the segregation and weeping phenomena is not ideal. The key point of the technical scheme is as follows: the special additive comprises thevarious components by mass percent: 20%-22% of a water reducer, 1.8%-2% of a retarder, 1.5%-1.6% of a thickener, 0.03%-0.05% of an air entraining agent, 0.04%-0.08% of a defoamer, 8%-12% of an early strength agent and the balance of water. The concrete additive at the proportion is low in sensitivity, the influence of the concrete additive on the fluidity of the concrete is easy to control when the additive is doped, the wrapping property and the cohesiveness of a concrete mixture are good, the segregation and weeping phenomena do not occur easily, and the surface of the prepared bare concretebarely has bubbles.

Description

technical field [0001] The invention relates to a concrete admixture, more specifically, it relates to a special admixture for fair-faced concrete. Background technique [0002] Fair-faced concrete (fair-faced concrete) is a concrete that directly uses the natural texture of concrete as a finishing effect, and can be divided into ordinary fair-faced concrete, facing fair-faced concrete and decorative fair-faced concrete. In order to meet the fluidity and bleeding requirements of the concrete mixture during fair-faced concrete, admixtures are usually added during the mixing of fair-faced concrete to improve the performance of fair-faced concrete. [0003] In the prior art, the Chinese patent application publication number CN101767954A discloses a composite admixture for recycled aggregate concrete products, which is made of the following components in weight ratio: sodium sulfate 20-30%; triethanolamine 1-2%; Wood calcium 5-6%; sodium rosinate 0.15-0.2%; NaOH 0.01-0.02%; dih...

AI Technical Summary

Problems solved by technology

[0004] However, up to 30%-40% of dihydrate gypsum has been added to the above-mentioned admixture. Dihydrate gypsum is a powdery solid mineral that solidifies slowly. When the amount is too large, it has a great influence on the fluidity and strength of concrete, and gypsum Excessive dosage will increase the brittleness of concrete and reduce the compressive and flexural strength

How to develop a fair-faced concrete admixture with low sensitivity, little impact on concrete fluidity, effective reduction of segregation and bleeding, and little impact on concrete strength is a problem that needs to be solved in the industry

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